Tubing machine



April 14, 1931. A. w. SPAULDING TUBING MACHINE F 'iled March 2, 1929 Z. G T

L INVE NTEJR 52x4 Patented Apr. 14, 1931 PATENT OFFICE ARTHUR W. SPAULIDING, F OAKLAND, CALIFORNIA TUBING MACHINE Application filed March 2, 1929 Serial No. 343,868.

My invention relates to improvements in machinery for the manufacture of tubing, and the objects of my improvement are to provide means for converting sheet metal into seamless tubing. Further objects of my invention are to provide a sheet metal blank with a perforation, and conical rollers for drawing in the lips of the perforation, and for rolling and enlarging the opening until the sheet metal takes the form, in whole or in part, of a tube.

I accomplish these objects by the means illustrated in the accompanying illustrations, in which Fig. 1 is a side elevation of the two conical rollers and a perforated sheet of metal just entering the machine, and

Fig. 2 is a top view showing the angle at which the metal sheet is held while being fed between the rollers.

The tubing machine consists essentially of two cylindrical shafts 2 and 3 with conical ends 4: and 5. The conical portions of the shafts rotate upon each other without friction in opposite directions, the axes of the shafts forming an angle with each other.

In operation, the sheet of metal 1 is perforated by being punched in such manner as to press aside the metal instead of cutting it away, so that a lip will be formed at the point 6 which protrudes from one side of the sheet of metal.

The metal sheet is then held at an appropriate angle both to horizontal and perpen dicular planes while the lip 6 is caught between the conical portions of the rollers 2 and 3. When fed in this manner between the two rollers, the metal lip will be caught between the rounded tips 4 and 5 and drawn in. Pressure between the rollers enlarges the hole and finally produces a metal tube encircling roller 2.

It is not the purpose of this application to designate any special method of mounting or driving the rollers, but to cover the basic means and process of producing a tube from a flat metal sheet by either hot or cold rolling.

I claim: 7 The method of forming tubing from sheet '0 metal, comprising the perforation of a metal ARTHUR W. SPAULDING. 

